Sex is so risky. STD's. Pregnancies. Emotional turmoil (not that hormones don't do that anyways).
When I was in HS my boyfriend had liked to spread it around... not when we were together... well, not at first... always bragged about all his exes... I felt tortured b/c I was totally inexperienced, waiting for someone special...
In hindsight, I should have let him go... love should feel wonderful, not like torture... I think I was just afraid to be alone, but when you are young there are so many options out there.
Have you seen Erin's article on relationships? How to Attract the Relationship of your Dreams